Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b77ef5b2d328b6…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 14:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a17176870ae2c2aba15f930b74a4ca92 SHA-1: 08d21a964fc28229b5c8e1f55ddf317637c50bf4 SHA-256: f0b77ef5b2d328b66e981b5ad5095900f1ed6f1400205d90357b0ec453ebe9ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a spearphishing attachment, likely leading to a compromised website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=the+wailing+watch+online PDF link annotation
    • http://www.cottagegrad.ru/files/file/62351900529.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rr2q10or3e9lnoon8501f488el/33124557253.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/xapufejetoputadurozejajef.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/51622388700.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/31887654169.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/54561436806.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/gisagirarijikukizu.pdfIn PDF document text
    • http://ultrarelaxedcbd.com/newerac2c/userfiles/file/64050411363.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/xadorebijodolumesonopal.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/82910000742.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/ludutalonazototepifemepu.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/40657210321.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nijekojiza.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/69568737170.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210905_093040.pdfIn PDF document text
    • https://bachson.net/upload/file/wudipoxi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/1750187492.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/57339462481.pdfIn PDF document text
    • https://kimansion.com/uploads/file/86354409913.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/fomixakum.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sojejedu.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/pavavibafopudelalej.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/zutifozu.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/taden.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/46609556691.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 10292 bytes
SHA-256: b864626a4266363dabe1e9bb38877f951ba63d167ad624a6d7e279fb871c6239
font_01_sfnt_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 14440 bytes
SHA-256: 411b54fab12d3d09d0cfc6c301d0b26a5e84646cf2f0bb500195883dd3d56006